- A
Cloud CDN reduces egress costs by serving cached content from edge locations closer to users.
Correct: CDN reduces origin egress.
- B
Cloud CDN requires a global load balancer to function.
Why wrong: Cloud CDN can be used with both global and regional load balancers.
- C
Private Google Access eliminates the need for a NAT gateway.
Why wrong: Private Google Access does not replace NAT; it only provides access to Google APIs.
- D
Cloud CDN eliminates all egress costs for cached content.
Why wrong: CDN still incurs egress from edge locations to users, though usually at lower rates.
- E
Private Google Access reduces egress costs by allowing VMs to access Google APIs using internal IPs, avoiding internet egress charges.
Correct: API traffic uses Google's internal network, not internet egress.
PCNE Practice Question: Managing, Monitoring, and Optimising Network Operations
This PCNE practice question tests your understanding of managing, monitoring, and optimising network operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company wants to optimize costs for egress traffic from Compute Engine instances to the internet. They are considering using Cloud CDN and Private Google Access. Which TWO statements correctly describe how these services can reduce egress costs?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Cloud CDN reduces egress costs by serving cached content from edge locations closer to users.
Cloud CDN caches content at edge locations, reducing the amount of egress from the origin. Private Google Access allows VMs with internal IPs to access Google APIs without using public IPs, thus avoiding internet egress charges for API calls.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Cloud CDN reduces egress costs by serving cached content from edge locations closer to users.
Why this is correct
Correct: CDN reduces origin egress.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Cloud CDN requires a global load balancer to function.
Why it's wrong here
Cloud CDN can be used with both global and regional load balancers.
- ✗
Private Google Access eliminates the need for a NAT gateway.
Why it's wrong here
Private Google Access does not replace NAT; it only provides access to Google APIs.
- ✗
Cloud CDN eliminates all egress costs for cached content.
Why it's wrong here
CDN still incurs egress from edge locations to users, though usually at lower rates.
- ✓
Private Google Access reduces egress costs by allowing VMs to access Google APIs using internal IPs, avoiding internet egress charges.
Why this is correct
Correct: API traffic uses Google's internal network, not internet egress.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCNE NAT questions on configuration and troubleshooting.
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Managing, Monitoring, and Optimising Network Operations — study guide chapter
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FAQ
Questions learners often ask
What does this PCNE question test?
Managing, Monitoring, and Optimising Network Operations — This question tests Managing, Monitoring, and Optimising Network Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Cloud CDN reduces egress costs by serving cached content from edge locations closer to users. — Cloud CDN caches content at edge locations, reducing the amount of egress from the origin. Private Google Access allows VMs with internal IPs to access Google APIs without using public IPs, thus avoiding internet egress charges for API calls.
What should I do if I get this PCNE question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCNE NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jul 4, 2026
This PCNE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCNE exam.
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